Schematic in PDF form for the IBM ThinkPad X201i, the Core i3 variant of the X201 ultraportable, as the file name indicates. No board number or revision appears in the name, so compare the diagram against the markings printed on your motherboard before trusting it. A technician uses such a schematic to trace power rails, follow the power-on sequence, identify the parts behind a short and find test points around the charger and CPU circuits. Any PDF reader opens it, and text search helps locate net names and reference designators quickly.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @alischematics. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.